A preparation method of a pine needle biochar loaded iron-copper bimetallic catalyst and application thereof in degradation of phenol

By constructing an iron-copper-carbon ternary catalytic system using pine needle biochar-supported iron-copper bimetallic catalyst, the problems of pH dependence and catalyst recovery in the traditional Fenton process were solved, achieving efficient and stable phenol degradation, which is suitable for the treatment of recalcitrant organic wastewater.

CN122352256APending Publication Date: 2026-07-10ZHENGZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHENGZHOU UNIV
Filing Date
2026-04-20
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing technologies are difficult to efficiently degrade phenol pollutants. The traditional Fenton process has drawbacks such as harsh pH conditions, large iron sludge production, and difficulty in catalyst recovery. Single iron-based catalysts have low catalytic efficiency, and biochemical methods have poor tolerance to high concentrations of phenol.

Method used

A bimetallic iron-copper catalyst was supported on pine needle biochar and synthesized in one step through citric acid-assisted coordination and high-temperature calcination to construct an iron-copper-carbon ternary catalytic system. The copper species accelerated the Fe3+/Fe2+ cycle, while the biochar provided porosity and high specific surface area to enhance electron transfer and pollutant enrichment.

Benefits of technology

It achieves efficient H2O2 activation and pollutant degradation over a wide pH range. The catalyst maintains a degradation rate of over 90% after repeated use, which is significantly higher than that of single metal-supported materials. It is highly adaptable and environmentally friendly.

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Abstract

This invention relates to catalyst preparation methods and wastewater treatment technology, specifically to a method for preparing a pine needle biochar-supported iron-copper bimetallic catalyst and its application in the degradation of phenol. The preparation method is as follows: Pine needle biochar (PBC) is obtained by ultrasonic acid washing, drying, grinding, and sieving using waste pine needles as raw material; ferric nitrate, copper nitrate, and PBC are mixed at a preset mass ratio to form a precursor suspension; citric acid solution is then added for metal coordination, followed by water bath evaporation to form a gel; after drying, the precursor is obtained and then calcined at 800 °C for 4 h under N2 atmosphere. By adjusting the ratio of copper component to PBC, a Fe1Cu4@PBC (1:2) catalyst with optimal degradation performance is obtained. This system has a wide applicable pH range (3~11) and can efficiently activate H2O2 to degrade common pollutants such as phenol, rhodamine B, methylene blue, and malachite green within 6 min. After 6 cycles, the degradation efficiency remains at 100%, and the metal leaching concentration is lower than the drinking water standard limit. The catalyst of this invention solves the problems of narrow pH adaptation range and limited catalytic activity of existing heterogeneous Fenton catalysts, and has the advantages of simple preparation, low cost, good stability, easy recovery and great potential for engineering applications.
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